CN104944833A - Microcapsule for self-repair concrete and preparation method of self-repair concrete - Google Patents
Microcapsule for self-repair concrete and preparation method of self-repair concrete Download PDFInfo
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- CN104944833A CN104944833A CN201510148725.XA CN201510148725A CN104944833A CN 104944833 A CN104944833 A CN 104944833A CN 201510148725 A CN201510148725 A CN 201510148725A CN 104944833 A CN104944833 A CN 104944833A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
- C04B24/383—Cellulose or derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1033—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/02—Making microcapsules or microballoons
- B01J13/04—Making microcapsules or microballoons by physical processes, e.g. drying, spraying
- B01J13/043—Drying and spraying
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1048—Polysaccharides, e.g. cellulose, or derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
- C04B22/142—Sulfates
- C04B22/148—Aluminium-sulfate
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2676—Polystyrenes
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
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Abstract
The invention discloses a microcapsule for self-repair concrete and a preparation method of the self-repair concrete. The microcapsule comprises a capsule core and a capsule wall, wherein the capsule core is composed of a repair agent, microcrystalline cellulose and Tween 80; and the capsule wall material is a crack-stress-sensitive high-polymer organic material. The preparation method of the self-repair concrete comprises the following steps: weighing proper amounts of cement, sand, water and the microcapsule, wherein every cubic meter of concrete contains 0.05-0.08 cubic meter of microcapsule; stirring the cement, sand and microcapsule until the components are dispersed uniformly; and pouring the water into the mixture of the cement, sand and microcapsule, and stirring uniformly. The microcapsule can be doped into the concrete to form the microcapsule concrete self-repair system, thereby implementing self-repair capability of the concrete crack; and the microcapsule concrete self-repair system has the characteristic of intelligent control.
Description
[technical field]
The present invention relates to distress in concrete selfreparing, particularly relate to a kind of for the microcapsule of self-repair concrete and the preparation method of self-repair concrete.
[background technology]
Concrete is the most widely used present material of construction and structured material.Concrete is due to the moiety of structure itself and bearing capacity feature thereof, often there are some original microfractures in its inside, at it during one's term of military service, along with the change of load and the passing of time, the crackle of its inside can be extended to crack, even extending into surface causes concrete material to ftracture, after formation through crack, concrete easily suffers erosion and the destruction of external environment and various adverse factor, as steel bar corrosion, carbonization, Chloride Attack and sulphate attack etc., finally cause the cracking of concrete material, destroy, do not meet service requirements, have a strong impact on the weather resistance of concrete material.
The control of fracture and reparation are the most important thing links improving concrete material weather resistance, and the common restorative procedure at present for crack has following several: organic coating restorative procedure, slip casting method restorative procedure, fibers encapsulation restorative procedure,
The formula of application number a kind of concrete creak self-repair material that has been the disclosure of the invention of CN200810158131.7 and preparation technology, the silicate cement of its formula 62-77% by weight percentage; The Trisodium Citrate of 0.2-1.0%; The choline of 3.0-8.0%; The water glass of 1-4%; The calcium oxide of 1.0-3.0%; The 80-120 order quartz sand proportioning of 22-35% forms, the 80-120 order quartz sand of the silicate cement of 62-77%, 22-35% mixes by its preparation technology by weight percentage in mixing machine, the Trisodium Citrate of 0.2-1.0%, the choline of 3.0-8.0%, 1-4% water glass, 1.0-3.0% calcium oxide is added in silicate cement and quartz sand mixing process, mix after 3-5 minute, discharging, sealing is preserved.
But all there is significant limitation in the method for above-mentioned distress in concrete selfreparing.Such as: intelligent poor, cannot the carrying out and repair timely of tracking in time crack.This makes the repairing effect of distress in concrete, and very large drawback appears in the control in crack and long-term monitoring aspect.
[summary of the invention]
The technical problem to be solved in the present invention is to provide a kind of microcapsule with the physical trigger microcapsule of crack stress sensitive to external world, be incorporated in concrete, form microcapsule concrete self-healing system, realize the self-reparing capability of distress in concrete, and there is the feature of intelligent control.
Another technical problem that will solve of the present invention is to provide a kind of preparation method with the self-repair concrete of intelligent control ability.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is, a kind of microcapsule for self-repair concrete, described microcapsule comprise capsule-core and cyst wall, the component of described capsule-core comprises renovation agent, Microcrystalline Cellulose and tween 80, and the material of described cyst wall is the macromolecule organic material of fracture stress sensitive.
The above-described microcapsule for self-repair concrete, the preparation process of capsule-core is as follows:
201, capsule-core raw material is taken by following weight part:
30% described ethanol refers to that concentration of volume percent is the ethanol of 30%;
202, extrude take out thin: the charging opening at extrusion equipment after fully being mixed by capsule-core raw material drops into, and extrudes the core materials of rice noodles strip;
203, discharging is round as a ball: by described rice noodles strip core materials, pour the cylinder in rolling circle equipment into, roll out capsule-core particulate;
204, dry: capsule-core to be rolled out in the cylinder of particulate drying plant, under drying temperature 30-40 DEG C of force ventilated condition, carry out drying treatment.
The above-described microcapsule for self-repair concrete, the preparation process of microcapsule is as follows:
301, prepare coating liquid: macromolecule organic material 100 weight part taking fracture stress sensitive, solvent 600-1200 weight part, is dissolved in solvent by the macromolecule organic material of fracture stress sensitive;
302, spray coating: cylinder capsule-core being put into spray coating equipment, under dressing pattern, is sprayed onto the capsule-core of rolling on by coating liquid by the fog nozzle of equipment with pump, added 1-2g talcum powder every 5-10 minute;
303, dry: temperature 30-40 DEG C, under force ventilated condition, dry 10-20 minute in the cylinder of drying plant, then Temperature fall, dry, obtain microcapsule.
The above-described microcapsule for self-repair concrete, the macromolecule organic material of fracture stress sensitive is polyacrylic resin, polystyrene resin or ethyl cellulose.
The above-described microcapsule for self-repair concrete, when step 301 prepares coating liquid, ethyl cellulose is 100 weight parts, ethanol 150-300 weight part, toluene 800-1000 weight part; Ethyl cellulose is dissolved in the mixed solution of ethanol and toluene.
The above-described microcapsule for self-repair concrete, when step 301 prepares coating liquid, polystyrene is 100 weight parts, trichloromethane 900-1600 weight part; Polystyrene is dissolved in trichloromethane.
The above-described microcapsule for self-repair concrete, microcapsule are spherical, and particle diameter is 200-500 micron, and the thickness of cyst wall is 50-200 micron.
The above-described microcapsule for self-repair concrete, described renovation agent is aluminosulfate cement.
A preparation method for self-repair concrete, comprises the following steps:
901, take appropriate cement, sand, water and above-mentioned microcapsule, microcapsule contain the ratio metering of 0.05 cubic metre of-0.08 cubic metre of microcapsule according to every cubic meter of concrete;
902, by cement, sand and microcapsule stir, until be uniformly dispersed;
903, water is poured into cement, in the mixture of sand and microcapsule, stir.
The crack autogenous healing concrete that the present invention is based on microcapsule is the microcapsule mixing the physical trigger function with stress sensitive to external world in concrete traditional components, form the self-healing system that intelligence repairs crack therein, through concrete typical production process, uniform microcapsule is distributed in concrete, and in mixing and maintenance processes, microencapsulation material fragmentation can not occur.In concrete use procedure, once there be crack to produce stress, trigger microcapsules rupture, release renovation agent, filling cracks, reaches the object of repairing crack.Otherwise when inside concrete ambient stable, when namely not having crack to produce, the microcapsule implanted in concrete can long-term stability be present in matrix.The microcapsule preparation process that the present invention uses is simple to operate, easily realizes, and industrial massization is produced and provided condition.
[accompanying drawing explanation]
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the stereoscan photograph that the present invention has the microcapsule of physical trigger function;
Fig. 2 is the distribution plan (XCT horizontal section) of microcapsule inside cement-based material sample of the present invention;
Fig. 3 is that microcapsule of the present invention are being subject to the stereoscan photograph under physical stress triggering;
Fig. 4 is the 3D restructuring graph of cement-based material sample interior microcapsule of the present invention, and wherein dark spheroid is microcapsule, and the spheroid of light color is hole.
Fig. 5-1 is the image of the reparation XCT horizontal section of microcapsule fracture after the embodiment of the present invention 1 cement-based material sample repaired the length of time at 0 day;
Fig. 5-2 is images of the reparation XCT horizontal section of microcapsule fracture after the embodiment of the present invention 1 cement-based material sample repaired the length of time at 63 days;
Fig. 5-3 is images of the reparation XCT horizontal section of microcapsule fracture after the embodiment of the present invention 1 cement-based material sample repaired the length of time at 105 days;
Fig. 6-1 is the image of the reparation XCT horizontal section of microcapsule fracture after the embodiment of the present invention 2 cement-based material sample repaired the length of time at 0 day;
Fig. 6-2 is images of the reparation XCT horizontal section of microcapsule fracture after the embodiment of the present invention 2 cement-based material sample repaired the length of time at 63 days;
Fig. 6-3 is images of the reparation XCT horizontal section of microcapsule fracture after the embodiment of the present invention 2 cement-based material sample repaired the length of time at 105 days;
Fig. 7 is gross sample shared by crack in cement-based material sample in the length of time repaired by the cement-based material sample of the embodiment of the present invention 1 and embodiment 2 volume fraction in difference;
Fig. 8 is microcapsule fracture in cement-based material sample in the length of time repaired by the cement-based material sample of the embodiment of the present invention 1 and embodiment 2 repair rate change in difference, and wherein repair rate equals preprosthetic crevice volume and deducts the difference of the crevice volume after reparation divided by preprosthetic volume.
[embodiment]
The present invention is based on the physical trigger microcapsule mixing in the crack autogenous healing concrete of microcapsule and have crack stress sensitive to external world, every cubic meter of concrete contains the microcapsule of 0.05 cubic metre-0.08 cubic metre.
Microcapsule are ball, and particle diameter is 200-500 micron, and comprise capsule-core and cyst wall (wall thickness is 50-200 micron), the core group of capsule-core is divided into renovation agent; Cyst wall is that the macromolecule organic material of counter stress sensitivity is made.
The present invention is based on the crack autogenous healing concrete of microcapsule, the cyst material of microcapsule selects the macromolecule organic material of fracture stress sensitive, such as polyacrylic resin, polystyrene resin or ethyl cellulose.Can break when crack produces, discharge core materials.Core materials is chosen and can be played the solidification repair materials (as epoxy resin, solidifying agent etc.) filling up repair by fracture, realizes the repair of fracture like this.Or, choose some renovation agents and can form expanded product filling cracks (as aluminosulfate cement) in inside concrete reaction, thus realize the repair of fracture.
Embodiment 1: the preparation of ethyl cellulose parcel sulplo-aluminate self-repair concrete
Prepared by microcapsule:
1) capsule-core preparation:
Capsule-core raw material mass mixture ratio (weight part):
| Formula number | Aluminosulfate cement | Microcrystalline Cellulose | Tween 80 | 30% ethanol |
| No. I formula | 100 | 90 | 8 | 100 |
| No. II formula | 100 | 90 | 10 | 110 |
| No. III formula | 100 | 95 | 9 | 110 |
| No. IV formula | 100 | 95 | 10 | 115 |
| No. V formula | 100 | 100 | 10 | 120 |
Wherein, 30% ethanol refers to that concentration of volume percent is the ethanol of 30%.
By above-mentioned five kinds of capsule-cores formula raw material quality proportioning, being carried out extruding by the mixture obtained input extrusion equipment respectively takes out carefully, extrude the core materials of rice noodles strip, rice noodles strip core materials is poured into the cylinder in rolling circle equipment, roll out capsule-core particulate, capsule-core particulate, under 30-40 DEG C of force ventilated condition, carries out drying treatment, obtained capsule-core;
2) cyst wall preparation (weight part):
Coating liquid raw material mass mixture ratio:
| Formula number | Ethyl cellulose | Ethanol | Toluene |
| No. I formula | 100 | 150 | 850 |
| No. II formula | 100 | 200 | 800 |
| No. III formula | 100 | 200 | 1000 |
| No. IV formula | 100 | 300 | 900 |
| No. V formula | 100 | 240 | 960 |
Take raw material by above-mentioned coating liquid formula material quality proportioning, then ethyl cellulose is dissolved in the mixed solution of ethanol and toluene, makes coating liquid.
The coating liquid of atomization is sprayed onto step 1) on the capsule-core that obtains, and added 1-2g talcum powder every 5-10 minute, dry 10-20 minute under drying temperature 30-40 DEG C of force ventilated condition, then Temperature fall, dry, obtain microcapsule.
The microcapsule made are spheroidal, and particle diameter is 200-500 micron, and the thickness of cyst wall is 50-100 micron.
The preparation of ethyl cellulose type sulplo-aluminate self-repair concrete and performance test:
1) take 0.4 kg water, add 50 grams of sulplo-aluminate/ethyl cellulose microcapsules, stir until be uniformly dispersed; Water is poured in cement mixer, adds 1 kilogram of cement;
2) the slow rear fast stirring of elder generation is carried out to grout;
3), after vibrated concrete, progressively or step by step workpiece is watered;
4) leave standstill 1-2 as a child molding, strike off the concrete mortar that mould overflows, place 24 hours
5) after form removal, sample is proceeded to standard concrete curing box, maintenance 28 days.
6) microcapsule prepared are placed on below electron-microscope scanning instrument carry out photographic analysis, observe the needs whether prepared microcapsule meet self-healing system, as shown in Figure 1.Result shows that microcapsule prepared by the present invention have good physicals, comprises surface irregularity, uniform particle sizes, and forming degree is good, and this makes microcapsule be formed overall with concrete and to distribute uniformly, as shown in Figure 2 and Figure 4;
7) microcapsule are placed in physical stress trigger device, whether microcapsule prepared by research the present invention can break under stress, and as shown in Figure 3, result shows that the present invention prepares microcapsule and under Desirable physical stress, can realize triggering and break;
8) sand-cement slurry sample good for maintenance is carried out the load precompressed of 900N, that crack appears in inside, and carrying out and operative condition to microcapsule with X ray computer layer scanning technology (XCT) analysis and observation crack, observe the situation of microcapsules rupture release renovation agent, then sample is placed in normal curing condition (first to humidity more than 95%, temperature is at about 21 DEG C) and carries out maintenance.In 0,21,42,63,84, after 105 days, put sample and carry out scanning analysis in XCT, 3D reconstruct and picture processing analysis, observe the reparation situation of its fracture.Fig. 5-1, Fig. 5-2 and Fig. 5-3 represents that the same cross section of embodiment 1 microcapsule self-repair concrete is 0 day in reparation length of time respectively, the variation diagram of 63 days and 105 days.As shown in fig. 5-1, add pressure in preload, the crack that concrete occurs, make microcapsules rupture, renovation agent flows out.Along with the increase of repairing the length of time, renovation agent slowly flow into crack and free water reacts, and produces expanded product filling cracks, as shown in Fig. 5-2 and 5-3.Finally utilize picture Processing Technique, the crevice volume of the microcapsule self-repair concrete inside of different times is added up, thus obtain last crevice volume rate change and crack reparation variation diagram, as shown in Figure 6 and Figure 7.
Embodiment 2: the preparation of polystyrene parcel sulplo-aluminate self-repair concrete
Prepared by microcapsule:
1) capsule-core preparation:
Capsule-core raw material mass mixture ratio (weight part):
| Formula number | Aluminosulfate cement | Microcrystalline Cellulose | Tween 80 | 30% ethanol |
| No. I formula | 100 | 90 | 8 | 100 |
| No. II formula | 100 | 90 | 10 | 110 |
| No. III formula | 100 | 95 | 9 | 110 |
| No. IV formula | 100 | 95 | 10 | 115 |
| No. V formula | 100 | 100 | 10 | 120 |
By above-mentioned five kinds of capsule-cores formula raw material quality proportioning, being carried out extruding by the mixture obtained input extrusion equipment takes out carefully, extrude the core materials of rice noodles strip, rice noodles strip core materials is poured into the cylinder in rolling circle equipment, roll out capsule-core particulate, capsule-core particulate, under 30-40 DEG C of force ventilated condition, carries out drying treatment, obtained capsule-core;
2) cyst wall preparation:
Coating liquid raw material mass mixture ratio (weight part):
| Formula number | Polystyrene | Trichloromethane |
| No. I formula | 100 | 900 |
| No. II formula | 100 | 1000 |
| No. III formula | 100 | 1200 |
| No. IV formula | 100 | 1400 |
| No. V formula | 100 | 1600 |
Take raw material by above-mentioned coating liquid formula material quality proportioning, then polystyrene is dissolved in trichloromethane, makes coating liquid.
The coating liquid of atomization is sprayed onto step 1) on the capsule-core that obtains, and added 1-2g talcum powder every 5-10 minute, dry 10-20 minute under drying temperature 30-40 DEG C of force ventilated condition, then Temperature fall, dry, obtain microcapsule.
The microcapsule made are spheroidal, and particle diameter is 200-500 micron, and the thickness of cyst wall is 50-100 micron.
The preparation of polystyrene type sulplo-aluminate self-repair concrete and performance test:
1) take 0.4 kg water, add 50 grams of sulplo-aluminates/polystyrene microcapsule, stir until be uniformly dispersed; Water is poured in cement mixer, adds 1 kilogram of cement;
2) the slow rear fast stirring of elder generation is carried out to grout;
3), after vibrated concrete, progressively or step by step workpiece is watered;
4) leave standstill 1-2 as a child molding, strike off the concrete mortar that mould overflows, place 24 hours
5) after form removal, sample is proceeded to standard concrete curing box, maintenance 28 days.
6) microcapsule prepared are placed on below electron-microscope scanning instrument carry out photographic analysis, observe the needs whether prepared microcapsule meet self-healing system, as shown in Figure 1.Result shows that microcapsule prepared by the present invention have good physicals, comprises surface irregularity, uniform particle sizes, and forming degree is good, and this makes microcapsule be formed overall with concrete and to distribute uniformly, as shown in Figure 2 and Figure 4;
7) microcapsule are placed in physical stress trigger device, whether microcapsule prepared by research the present invention can break under stress, and as shown in Figure 3, result shows that the present invention prepares microcapsule and under Desirable physical stress, can realize triggering and break;
8) sand-cement slurry sample good for maintenance is carried out the load precompressed of 1100N, that crack appears in inside, and carrying out and operative condition to microcapsule with X ray computer layer scanning technology (XCT) analysis and observation crack, observe the situation of microcapsules rupture release renovation agent, the condition then sample being placed in pure water submergence carries out maintenance.In 0,21,42,63,84, after 105 days, put sample and carry out scanning analysis in XCT, 3D reconstruct and picture processing analysis, observe the reparation situation of its fracture.Fig. 6-1, Fig. 6-2 and Fig. 6-3 represents that the same cross section of embodiment 2 microcapsule self-repair concrete is 0 day in reparation length of time respectively, the variation diagram of 63 days and 105 days.As in Figure 6-1, add pressure in preload, the crack that concrete occurs, make microcapsules rupture, renovation agent flows out.Along with the increase of repairing the length of time, renovation agent slowly flow into crack and free water reacts, and produces expanded product filling cracks, as shown in Fig. 6-2 and 6-3.Finally utilize picture Processing Technique, the crevice volume of the microcapsule self-repair concrete inside of different times is added up, thus obtain last crevice volume rate change and crack reparation variation diagram, as shown in Figure 7 and Figure 8.
The industrial production process of self-repair concrete carries out according to the following steps:
1) take appropriate cement, sand, water and microcapsule, microcapsule contain the ratio metering of 0.05 cubic metre of-0.08 cubic metre of microcapsule according to every cubic meter of concrete;
2) by cement, sand and microcapsule stir, until be uniformly dispersed;
3) water is poured into cement, in the mixture of sand and microcapsule, stir.
The present invention has the following advantages:
The crack autogenous healing concrete that the present invention is based on microcapsule is the microcapsule mixing the physical trigger function with stress sensitive to external world in concrete traditional components, form the self-healing system that intelligence repairs crack therein, through concrete typical production process, uniform microcapsule is distributed in concrete, and in mixing and maintenance processes, microencapsulation material fragmentation can not occur.In concrete use procedure, once there be crack to produce stress, trigger microcapsules rupture, release renovation agent, filling cracks, reaches the object of repairing crack.Otherwise when inside concrete ambient stable, when namely not having crack to produce, the microcapsule implanted in concrete can long-term stability be present in matrix.The microcapsule preparation process that the present invention uses is simple to operate, easily realizes, and industrial massization is produced and provided condition.
Claims (9)
1. the microcapsule for self-repair concrete, described microcapsule comprise capsule-core and cyst wall, it is characterized in that, the component of described capsule-core comprises renovation agent, Microcrystalline Cellulose and tween 80, and the material of described cyst wall is the macromolecule organic material of fracture stress sensitive.
2. the microcapsule for self-repair concrete according to claim 1, is characterized in that, the preparation process of capsule-core is as follows:
201, capsule-core raw material is taken by following weight part:
30% described ethanol refers to that concentration of volume percent is the ethanol of 30%;
202, extrude take out thin: the charging opening at extrusion equipment after fully being mixed by capsule-core raw material drops into, and extrudes the core materials of rice noodles strip;
203, discharging is round as a ball: by described rice noodles strip core materials, pour the cylinder in rolling circle equipment into, roll out capsule-core particulate;
204, dry: capsule-core to be rolled out in the cylinder of particulate drying plant, under drying temperature 30-40 DEG C of force ventilated condition, carry out drying treatment.
3. the microcapsule for self-repair concrete according to claim 1, is characterized in that, the preparation process of microcapsule is as follows:
301, prepare coating liquid: macromolecule organic material 100 weight part taking fracture stress sensitive, solvent 600-1200 weight part, is dissolved in solvent by the macromolecule organic material of fracture stress sensitive;
302, spray coating: cylinder capsule-core being put into spray coating equipment, under dressing pattern, is sprayed onto the capsule-core of rolling on by coating liquid by the fog nozzle of equipment with pump, added 1-2g talcum powder every 5-10 minute;
303, dry: temperature 30-40 DEG C, under force ventilated condition, dry 10-20 minute in the cylinder of drying plant, then Temperature fall, dry, obtain microcapsule.
4. the microcapsule for self-repair concrete according to claim 3, is characterized in that, the macromolecule organic material of fracture stress sensitive is polyacrylic resin, polystyrene resin or ethyl cellulose.
5. the microcapsule for self-repair concrete according to claim 4, is characterized in that, when step 301 prepares coating liquid, ethyl cellulose is 100 weight parts, ethanol 150-300 weight part, toluene 800-1000 weight part; Ethyl cellulose is dissolved in the mixed solution of ethanol and toluene.
6. the microcapsule for self-repair concrete according to claim 4, is characterized in that, when step 301 prepares coating liquid, polystyrene is 100 weight parts, trichloromethane 900-1600 weight part; Polystyrene is dissolved in trichloromethane.
7. the microcapsule for self-repair concrete according to claim 1, is characterized in that, microcapsule are spherical, and particle diameter is 200-500 micron, and the thickness of cyst wall is 50-200 micron.
8. the microcapsule for self-repair concrete according to claim 1, is characterized in that, described renovation agent is aluminosulfate cement.
9. a preparation method for self-repair concrete, is characterized in that, comprises the following steps:
901, take appropriate cement, sand, the microcapsule in water and claim 1 to 5 described in arbitrary claim, microcapsule contain the ratio metering of 0.05 cubic metre of-0.08 cubic metre of microcapsule according to every cubic meter of concrete;
902, by cement, sand and microcapsule stir, until be uniformly dispersed;
903, water is poured into cement, in the mixture of sand and microcapsule, stir.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510148725.XA CN104944833A (en) | 2015-03-31 | 2015-03-31 | Microcapsule for self-repair concrete and preparation method of self-repair concrete |
| PCT/CN2016/077788 WO2016155613A1 (en) | 2015-03-31 | 2016-03-30 | Microcapsule for self-repairing concrete and preparation method thereof, and self-repairing concrete and preparation method thereof |
| US15/562,111 US20180072624A1 (en) | 2015-03-31 | 2016-03-30 | Microcapsule for self-healing concrete and preparation method thereof, and self-healing concrete and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510148725.XA CN104944833A (en) | 2015-03-31 | 2015-03-31 | Microcapsule for self-repair concrete and preparation method of self-repair concrete |
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| Country | Link |
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| US (1) | US20180072624A1 (en) |
| CN (1) | CN104944833A (en) |
| WO (1) | WO2016155613A1 (en) |
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| US20180072624A1 (en) | 2018-03-15 |
| WO2016155613A1 (en) | 2016-10-06 |
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